Adelaide Research & Scholarship

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http://hdl.handle.net/2440/104891

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Value

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dc.contributor.author

Sparkes, B.

en

dc.contributor.author

Murphy, D.

en

dc.contributor.author

Taylor, R.

en

dc.contributor.author

Speirs, R.

en

dc.contributor.author

McCulloch, A.

en

dc.contributor.author

Scholten, R.

en

dc.date.issued

2016

en

dc.identifier.citation

Physical Review A, 2016; 94(2):023404-1-023404-8

en

dc.identifier.issn

2469-9926

en

dc.identifier.issn

2469-9934

en

dc.identifier.uri

http://hdl.handle.net/2440/104891

-

dc.description.abstract

We implement high-efficiency coherent excitation to a Rydberg state using stimulated Raman adiabatic passage in a cold-atom electron and ion source.We achieve an efficiency of 60% averaged over the laser excitation volume with a peak efficiency of 82%, a 1.6 times improvement relative to incoherent pulsed-laser excitation. Using pulsed electric field ionization of the Rydberg atoms we create electron bunches with durations of 250 ps. High-efficiency excitation will increase source brightness, crucial for ultrafast electron diffraction experiments, and coherent excitation to high-lying Rydberg states could allow for the reduction of internal bunch heating and the creation of a high-speed single-ion source.